Save resulting latent

After editing, when saving the image, you also save the resulting latent for continuing working on it later on (or e.g. generate interpolations)

viz/renderer.py

@@ -382,5 +382,6 @@ class Renderer:
             img = img.cpu().numpy()
             img = Image.fromarray(img)
         res.image = img
+        res.w = ws.cpu().numpy()
 
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